There are 5 definitions of RE in English:

RE1

Line breaks: RE
Pronunciation: /ɑːrˈiː/

Entry from British & World English dictionary

abbreviation

1Religious education (as a school subject).
1.1(In the UK) Royal Engineers.

Definition of RE in:

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Word of the day flippant
Pronunciation: ˈflipənt
adjective
not showing a serious or respectful attitude

There are 5 definitions of RE in English:

re2

Syllabification: re
Pronunciation: /rā
 
, rē
 
/

preposition

1In the matter of (used typically as the first word in the heading of an official document or to introduce a reference in an official letter): re: invoice 87
1.1About; concerning: I saw the deputy re the incident

Origin

Latin, ablative of res 'thing'.

Usage

It is often said that, strictly speaking, re should be used in headings and references, as in Re: Harrison versus Ortiz, but not as a normal word meaning ‘regarding,’ as in thanks for your letter re the job postings. However, the evidence suggests that re is now widely used in the second context in official and semiofficial contexts, and is now generally accepted. Be aware, however, that in certain formal contexts, if re is used in mid-sentence, some readers may regard it as business jargon or an inappropriate legalism. Often, concerning or about would be just as clear (and less likely to annoy).

Definition of RE in:

There are 5 definitions of RE in English:

re3

Syllabification: re

noun

Music
1(In solmization) the second note of a major scale.
1.1The note D in the fixed-do system.

Origin

Middle English re, representing (as an arbitrary name for the note) the first syllable of resonare, taken from a Latin hymn (see solmization).

Definition of RE in:

There are 5 definitions of RE in English:

Re4

Syllabification: Re
Variant spelling of Ra1.

Definition of RE in:

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Word of the day flippant
Pronunciation: ˈflipənt
adjective
not showing a serious or respectful attitude

There are 5 definitions of RE in English:

Re5

Syllabification: Re

symbol

The chemical element rhenium.

Definition of RE in:

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Word of the day flippant
Pronunciation: ˈflipənt
adjective
not showing a serious or respectful attitude